磁性斯格明子为下一代存储器和自旋电子设备带来了巨大的希望。虽然通常的研究集中于在块状磁体和重金属多层中发现这种自旋纹理，但人们对在二维(2D)磁性材料中寻找它们的兴趣越来越大。最近，我们制备了二维CrxTey系列的两个不同相：非中心对称CrTe1.38和中心对称CrTe0.96，居里温度分别约为200 K和300 K。详细的磁学研究表明CrTe1.38具有显着的面外磁各向异性。相比之下，CrTe0.96表现出弱的单轴磁各向异性。洛伦兹透射电子显微镜表明，CrTe1.38的自发铁磁基态由奈尔型斯格明子组成，而CrTe0.96则呈现布洛赫磁畴壁，这与它们的晶体对称性一致。这项研究扩展了准二维CrxTey材料体系，并为探索非平凡的自旋结构及其在自旋电子器件中的潜在应用开辟了新途径。

Magnetic skyrmions bring great oppotunities for next-generation memories and spintronic devices. While typical research focuses on finding such spin textures in bulk magnets and heavy-metal-based multilayers, there is a growing interest in searching for them in two-dimensional (2D) magnetic materials. Recently, we prepared two different phases of the 2D CrxTey series: non-centrosymmetric CrTe1.38 and centrosymmetric CrTe0.96, with Curie temperatures of approximately 200 K and 300 K, respectively. Detailed magnetic studies show that CrTe1.38 exhibits significant out-of-plane magnetic anisotropy. In contrast, CrTe0.96 shows weak uniaxial magnetic anisotropy. Lorentz transmission electron microscopy reveals that the spontaneous ferromagnetic ground state of CrTe1.38 consists of Néel-type skyrmions, while CrTe0.96 presents Bloch domain walls, which is consistent with their crystal symmetries. This study expands the quasi-2D CrxTey material system and paves the way for exploring non-trivial spin structures and their potential applications in spintronic devices.

图1 CrTe1.38晶体结构与低温下奈尔型拓扑磁结构洛伦兹电镜图像

相关论文发表于《应用物理快报》（Appl. Phys. Lett. 125, 152402 (2024)），博士后Suman Kalyan Pradhan博士为论文第一作者。论文链接：https://pubs.aip.org/aip/apl/article/125/15/152402/3315967